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Dielectric and Birefringent Properties of [(CH_3)_2NH_2]_5Cd_2CuCl_{11} Solid Solutions in the Region of Their Phase Transitions

100%

Eliyashevskyy Y., Kapustianyk V., Dacko S., Czapla Z., Batiuk A., Sveleba S.

Acta Physica Polonica A

2006

vol. 109

issue 2

171-178

On the basis of the optical and dielectric investigations of [(CH_3)_2NH_2]_5Cd_2CuCl_{11} solid solutions the existence of phase transitions at T_1=175 K and T_2=117.5 K was confirmed. Both phase transitions were found to be shifted toward lower temperatures with respect to the corresponding transitions in the "host" [(CH_3)_2NH_2]_5Cd_3Cl_{11} crystals. It was found that the proton conductivity in [(CH_3)_2NH_2 ]_5Cd_2CuCl_{11} crystals is realized through the Grotthus mechanism. The investigations of the birefringent properties confirmed existence of the structural changes at T_0=320 K connected with the complex co-operative effect involving weakening of the hydrogen bonds and modification of the Jahn-Teller distortion with temperature.

Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl_{1-x}Cr_{x}S Crystals

84%

Kapustianyk V., Eliyashevskyy Y., Czapla Z., Dacko S., Czupiński O., Rudyk V., Serkiz R., Sereda S., Semak S.

Acta Physica Polonica A

2015

vol. 127

issue 3

791-794

This paper presents the results of investigations of the temperature dependence of heat capacity and dielectric dispersion in the vicinity of ferroelectric-ferroelastic phase transition of dimethylammonium metal sulphate hexahydrate crystals DMAAl_{1-x}Cr_{x}S. In particular, it is shown that the isomorphous substitution of metal ion noticeably changes the temperature of phase transition and parameters of the fundamental ferroelectric dispersion observed around T_{c1}. These changes are explained in terms of clusters sizes and dynamics in the framework of order-disorder type phase transition mechanism.

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2 Acta Physica Polonica A

1 2015

1 2006

2 Czapla Z.

2 Dacko S.

2 Eliyashevskyy Y.

2 Kapustianyk V.

1 Batiuk A.

1 Czupiński O.

1 Rudyk V.

1 Semak S.

1 Sereda S.

1 Serkiz R.

1 Sveleba S.

Search results

Dielectric and Birefringent Properties of [(CH_3)_2NH_2]_5Cd_2CuCl_{11} Solid Solutions in the Region of Their Phase Transitions

Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl_{1-x}Cr_{x}S Crystals